I cover it up.

[He brushes aside his cloak to reveal a sleeveless green shirt, loose green pants without a fly or any openings, and a strip of green cloth tied around his waist as a belt. What, did you think he wasn't wearing anything under there? He lowers his arm and the cloak falls shut.]

It hurts if you scratch it on a branch.

What does this have to do with these underwear things though?